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Systems and methods for acquisition and tracking of low cnr gps signalsSystems and methods for acquisition and tracking of low cnr gps signals description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060071851, Systems and methods for acquisition and tracking of low cnr gps signals. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application claims priority to and any other benefits of U.S. Provisional Application Ser. No. 60/616,445 filed on Oct. 6, 2004, which is entitled DEEPLY INTEGRATED GPS/IMU, and U.S. Provisional Application Ser. No. 60/647,543, filed on Jan. 27, 2005, and which is entitled SYSTEMS AND METHODS FOR ACQUISITION AND TRACKING OF LOW CNR GPS SIGNALS, both of which are incorporated herein by reference in their entireties. FIELD OF THE INVENTION [0003] The present invention relates generally to the field of receivers for satellite-based radio navigation systems, e.g., Global Positioning System ("GPS") receivers, and more specifically to receivers for satellite-based radio navigation systems for acquisition and tracking of low carrier-to-noise ratio ("CNR") signals from radio navigation satellites. BACKGROUND OF THE INVENTION [0004] Receivers for satellite-based radio navigation systems, e.g., GPS receivers, are known in the art. Conventional unaided GPS receivers generally integrate Coarse Acquisition (CA) GPS signals from 10 to 20 ms. As a result, GPS signals cannot be acquired and tracked reliably by such systems if the Carrier-to-Noise Ratio (CNR) is below 32 dB-Hz. This limits the usage of conventional GPS receivers for a number of applications (e.g. indoor applications, precision agriculture applications near trees where the GPS signal is attenuated by the tree branches and foliage, or navigation in the presence of wideband interference). SUMMARY OF THE INVENTION [0005] In accordance with one aspect of the present invention, a system for acquisition and/or tracking of low carrier-to-noise ratio ("CNR") signals from radio navigation satellites is provided. An exemplary receiver for tracking of low carrier-to-noise ratio ("CNR") signals from a plurality of radio navigation satellites while the receiver is mobile, comprises: a radio frequency (RF) front-end that provides satellite data corresponding to signals received from the plurality of radio navigation satellites; an inertial measurement unit (MU) that provides inertial data; and a processor circuit in circuit communication with the RF front end and the IMU, the processor circuit being capable of using satellite data from the RF front-end and inertial data from the IMU to perform continuous carrier phase tracking of low CNR radio navigation satellite signals having a CNR of about 15 dB-Hz, while the receiver is mobile. [0006] In accordance with another aspect of the present invention, a method of acquisition and/or tracking of low CNR signals from radio navigation satellites is provided. An exemplary method of tracking of low carrier-to-noise ratio ("CNR") signals from a plurality of radio navigation satellites while the receiver is mobile, comprises the steps of: receiving signals from the plurality of radio navigation satellites; providing satellite data corresponding to the signals received from the plurality of radio navigation satellites; providing inertial data from an inertial measurement unit (IMU); and performing continuous carrier phase tracking of low CNR radio navigation satellite signals having a CNR of about 15 dB-Hz, while the receiver is mobile. BRIEF DESCRIPTION OF THE DRAWINGS [0007] The following detailed description of exemplary embodiments of the present invention can be best understood when read in conjunction with the following figures, where like structure is indicated with like reference numerals and in which: [0008] FIG. 1 is a very high-level block diagram of an exemplary receiver for a satellite-based radio navigation system that may be used for acquisition and tracking of low CNR signals from radio navigation satellites; [0009] FIG. 2 is a high-level block diagram of the exemplary receiver of FIG. 1, showing additional information about an exemplary GPS processor including an exemplary block processing engine; [0010] FIG. 3 is a high-level block diagram of the exemplary block processing of FIG. 2; [0011] FIG. 4 is a medium-level block diagram of an exemplary block I/O module; [0012] FIG. 5 is a timeline showing overlap of successive blocks in the block I/O module of FIG. 4; [0013] FIG. 6 is a medium-level block diagram of an exemplary carrier wipe-off module; [0014] FIG. 7 is a high-level simplified diagram showing an exemplary block estimator of the present invention; [0015] FIG. 8 is a timeline showing two exemplary averaging schemes; [0016] FIG. 9 is a medium-level block diagram of an exemplary averaging module; [0017] FIG. 10A is a medium-level block diagram of an exemplary FFT block correlator module; [0018] FIG. 10B is a block diagram showing an exemplary code Doppler compensation method in the frequency domain-based circular correlation operation. [0019] FIG. 11 is a very high-level block diagram of another exemplary receiver for a satellite-based radio navigation system that can be used for acquisition and tracking of low CNR signals from radio navigation satellites; [0020] FIGS. 12-14 are screenshots of exemplary software; Continue reading about Systems and methods for acquisition and tracking of low cnr gps signals... Full patent description for Systems and methods for acquisition and tracking of low cnr gps signals Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Systems and methods for acquisition and tracking of low cnr gps signals patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Systems and methods for acquisition and tracking of low cnr gps signals or other areas of interest. ### Previous Patent Application: Gps receiver with encrypted data transmission Next Patent Application: Positioning signal transmission apparatus Industry Class: Communications: directive radio wave systems and devices (e.g., radar, radio navigation) ### FreshPatents.com Support Thank you for viewing the Systems and methods for acquisition and tracking of low cnr gps signals patent info. IP-related news and info Results in 0.30341 seconds Other interesting Feshpatents.com categories: Canon USA , Celera Genomics , Cephalon, Inc. , Cingular Wireless , Clorox , Colgate-Palmolive , Corning , Cymer , 174 |
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